diff options
Diffstat (limited to 'drivers/gpu/drm/drm_gem_framebuffer_helper.c')
-rw-r--r-- | drivers/gpu/drm/drm_gem_framebuffer_helper.c | 220 |
1 files changed, 195 insertions, 25 deletions
diff --git a/drivers/gpu/drm/drm_gem_framebuffer_helper.c b/drivers/gpu/drm/drm_gem_framebuffer_helper.c index 3a7ace19a902..cac15294aef6 100644 --- a/drivers/gpu/drm/drm_gem_framebuffer_helper.c +++ b/drivers/gpu/drm/drm_gem_framebuffer_helper.c @@ -21,6 +21,13 @@ #include <drm/drm_modeset_helper.h> #include <drm/drm_simple_kms_helper.h> +#define AFBC_HEADER_SIZE 16 +#define AFBC_TH_LAYOUT_ALIGNMENT 8 +#define AFBC_HDR_ALIGN 64 +#define AFBC_SUPERBLOCK_PIXELS 256 +#define AFBC_SUPERBLOCK_ALIGNMENT 128 +#define AFBC_TH_BODY_START_ALIGNMENT 4096 + /** * DOC: overview * @@ -54,19 +61,15 @@ struct drm_gem_object *drm_gem_fb_get_obj(struct drm_framebuffer *fb, } EXPORT_SYMBOL_GPL(drm_gem_fb_get_obj); -static struct drm_framebuffer * -drm_gem_fb_alloc(struct drm_device *dev, +static int +drm_gem_fb_init(struct drm_device *dev, + struct drm_framebuffer *fb, const struct drm_mode_fb_cmd2 *mode_cmd, struct drm_gem_object **obj, unsigned int num_planes, const struct drm_framebuffer_funcs *funcs) { - struct drm_framebuffer *fb; int ret, i; - fb = kzalloc(sizeof(*fb), GFP_KERNEL); - if (!fb) - return ERR_PTR(-ENOMEM); - drm_helper_mode_fill_fb_struct(dev, fb, mode_cmd); for (i = 0; i < num_planes; i++) @@ -76,10 +79,9 @@ drm_gem_fb_alloc(struct drm_device *dev, if (ret) { drm_err(dev, "Failed to init framebuffer: %d\n", ret); kfree(fb); - return ERR_PTR(ret); } - return fb; + return ret; } /** @@ -123,10 +125,13 @@ int drm_gem_fb_create_handle(struct drm_framebuffer *fb, struct drm_file *file, EXPORT_SYMBOL(drm_gem_fb_create_handle); /** - * drm_gem_fb_create_with_funcs() - Helper function for the - * &drm_mode_config_funcs.fb_create - * callback + * drm_gem_fb_init_with_funcs() - Helper function for implementing + * &drm_mode_config_funcs.fb_create + * callback in cases when the driver + * allocates a subclass of + * struct drm_framebuffer * @dev: DRM device + * @fb: framebuffer object * @file: DRM file that holds the GEM handle(s) backing the framebuffer * @mode_cmd: Metadata from the userspace framebuffer creation request * @funcs: vtable to be used for the new framebuffer object @@ -134,23 +139,26 @@ EXPORT_SYMBOL(drm_gem_fb_create_handle); * This function can be used to set &drm_framebuffer_funcs for drivers that need * custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to * change &drm_framebuffer_funcs. The function does buffer size validation. + * The buffer size validation is for a general case, though, so users should + * pay attention to the checks being appropriate for them or, at least, + * non-conflicting. * * Returns: - * Pointer to a &drm_framebuffer on success or an error pointer on failure. + * Zero or a negative error code. */ -struct drm_framebuffer * -drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file, - const struct drm_mode_fb_cmd2 *mode_cmd, - const struct drm_framebuffer_funcs *funcs) +int drm_gem_fb_init_with_funcs(struct drm_device *dev, + struct drm_framebuffer *fb, + struct drm_file *file, + const struct drm_mode_fb_cmd2 *mode_cmd, + const struct drm_framebuffer_funcs *funcs) { const struct drm_format_info *info; struct drm_gem_object *objs[4]; - struct drm_framebuffer *fb; int ret, i; info = drm_get_format_info(dev, mode_cmd); if (!info) - return ERR_PTR(-EINVAL); + return -EINVAL; for (i = 0; i < info->num_planes; i++) { unsigned int width = mode_cmd->width / (i ? info->hsub : 1); @@ -175,19 +183,55 @@ drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file, } } - fb = drm_gem_fb_alloc(dev, mode_cmd, objs, i, funcs); - if (IS_ERR(fb)) { - ret = PTR_ERR(fb); + ret = drm_gem_fb_init(dev, fb, mode_cmd, objs, i, funcs); + if (ret) goto err_gem_object_put; - } - return fb; + return 0; err_gem_object_put: for (i--; i >= 0; i--) drm_gem_object_put_unlocked(objs[i]); - return ERR_PTR(ret); + return ret; +} +EXPORT_SYMBOL_GPL(drm_gem_fb_init_with_funcs); + +/** + * drm_gem_fb_create_with_funcs() - Helper function for the + * &drm_mode_config_funcs.fb_create + * callback + * @dev: DRM device + * @file: DRM file that holds the GEM handle(s) backing the framebuffer + * @mode_cmd: Metadata from the userspace framebuffer creation request + * @funcs: vtable to be used for the new framebuffer object + * + * This function can be used to set &drm_framebuffer_funcs for drivers that need + * custom framebuffer callbacks. Use drm_gem_fb_create() if you don't need to + * change &drm_framebuffer_funcs. The function does buffer size validation. + * + * Returns: + * Pointer to a &drm_framebuffer on success or an error pointer on failure. + */ +struct drm_framebuffer * +drm_gem_fb_create_with_funcs(struct drm_device *dev, struct drm_file *file, + const struct drm_mode_fb_cmd2 *mode_cmd, + const struct drm_framebuffer_funcs *funcs) +{ + struct drm_framebuffer *fb; + int ret; + + fb = kzalloc(sizeof(*fb), GFP_KERNEL); + if (!fb) + return ERR_PTR(-ENOMEM); + + ret = drm_gem_fb_init_with_funcs(dev, fb, file, mode_cmd, funcs); + if (ret) { + kfree(fb); + return ERR_PTR(ret); + } + + return fb; } EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_funcs); @@ -265,6 +309,132 @@ drm_gem_fb_create_with_dirty(struct drm_device *dev, struct drm_file *file, } EXPORT_SYMBOL_GPL(drm_gem_fb_create_with_dirty); +static __u32 drm_gem_afbc_get_bpp(struct drm_device *dev, + const struct drm_mode_fb_cmd2 *mode_cmd) +{ + const struct drm_format_info *info; + + info = drm_get_format_info(dev, mode_cmd); + + /* use whatever a driver has set */ + if (info->cpp[0]) + return info->cpp[0] * 8; + + /* guess otherwise */ + switch (info->format) { + case DRM_FORMAT_YUV420_8BIT: + return 12; + case DRM_FORMAT_YUV420_10BIT: + return 15; + case DRM_FORMAT_VUY101010: + return 30; + default: + break; + } + + /* all attempts failed */ + return 0; +} + +static int drm_gem_afbc_min_size(struct drm_device *dev, + const struct drm_mode_fb_cmd2 *mode_cmd, + struct drm_afbc_framebuffer *afbc_fb) +{ + __u32 n_blocks, w_alignment, h_alignment, hdr_alignment; + /* remove bpp when all users properly encode cpp in drm_format_info */ + __u32 bpp; + + switch (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK) { + case AFBC_FORMAT_MOD_BLOCK_SIZE_16x16: + afbc_fb->block_width = 16; + afbc_fb->block_height = 16; + break; + case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8: + afbc_fb->block_width = 32; + afbc_fb->block_height = 8; + break; + /* no user exists yet - fall through */ + case AFBC_FORMAT_MOD_BLOCK_SIZE_64x4: + case AFBC_FORMAT_MOD_BLOCK_SIZE_32x8_64x4: + default: + drm_dbg_kms(dev, "Invalid AFBC_FORMAT_MOD_BLOCK_SIZE: %lld.\n", + mode_cmd->modifier[0] + & AFBC_FORMAT_MOD_BLOCK_SIZE_MASK); + return -EINVAL; + } + + /* tiled header afbc */ + w_alignment = afbc_fb->block_width; + h_alignment = afbc_fb->block_height; + hdr_alignment = AFBC_HDR_ALIGN; + if (mode_cmd->modifier[0] & AFBC_FORMAT_MOD_TILED) { + w_alignment *= AFBC_TH_LAYOUT_ALIGNMENT; + h_alignment *= AFBC_TH_LAYOUT_ALIGNMENT; + hdr_alignment = AFBC_TH_BODY_START_ALIGNMENT; + } + + afbc_fb->aligned_width = ALIGN(mode_cmd->width, w_alignment); + afbc_fb->aligned_height = ALIGN(mode_cmd->height, h_alignment); + afbc_fb->offset = mode_cmd->offsets[0]; + + bpp = drm_gem_afbc_get_bpp(dev, mode_cmd); + if (!bpp) { + drm_dbg_kms(dev, "Invalid AFBC bpp value: %d\n", bpp); + return -EINVAL; + } + + n_blocks = (afbc_fb->aligned_width * afbc_fb->aligned_height) + / AFBC_SUPERBLOCK_PIXELS; + afbc_fb->afbc_size = ALIGN(n_blocks * AFBC_HEADER_SIZE, hdr_alignment); + afbc_fb->afbc_size += n_blocks * ALIGN(bpp * AFBC_SUPERBLOCK_PIXELS / 8, + AFBC_SUPERBLOCK_ALIGNMENT); + + return 0; +} + +/** + * drm_gem_fb_afbc_init() - Helper function for drivers using afbc to + * fill and validate all the afbc-specific + * struct drm_afbc_framebuffer members + * + * @dev: DRM device + * @afbc_fb: afbc-specific framebuffer + * @mode_cmd: Metadata from the userspace framebuffer creation request + * @afbc_fb: afbc framebuffer + * + * This function can be used by drivers which support afbc to complete + * the preparation of struct drm_afbc_framebuffer. It must be called after + * allocating the said struct and calling drm_gem_fb_init_with_funcs(). + * It is caller's responsibility to put afbc_fb->base.obj objects in case + * the call is unsuccessful. + * + * Returns: + * Zero on success or a negative error value on failure. + */ +int drm_gem_fb_afbc_init(struct drm_device *dev, + const struct drm_mode_fb_cmd2 *mode_cmd, + struct drm_afbc_framebuffer *afbc_fb) +{ + const struct drm_format_info *info; + struct drm_gem_object **objs; + int ret; + + objs = afbc_fb->base.obj; + info = drm_get_format_info(dev, mode_cmd); + if (!info) + return -EINVAL; + + ret = drm_gem_afbc_min_size(dev, mode_cmd, afbc_fb); + if (ret < 0) + return ret; + + if (objs[0]->size < afbc_fb->afbc_size) + return -EINVAL; + + return 0; +} +EXPORT_SYMBOL_GPL(drm_gem_fb_afbc_init); + /** * drm_gem_fb_prepare_fb() - Prepare a GEM backed framebuffer * @plane: Plane |